Izmjenjena struktura, dodan backand

web/node_modules/react-error-overlay/lib/effects/unhandledError.js

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+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+var boundErrorHandler = null;
+
+function errorHandler(callback, e) {
+  if (!e.error) {
+    return;
+  }
+  // $FlowFixMe
+  var error = e.error;
+
+  if (error instanceof Error) {
+    callback(error);
+  } else {
+    // A non-error was thrown, we don't have a trace. :(
+    // Look in your browser's devtools for more information
+    callback(new Error(error));
+  }
+}
+
+function registerUnhandledError(target, callback) {
+  if (boundErrorHandler !== null) {
+    return;
+  }
+  boundErrorHandler = errorHandler.bind(undefined, callback);
+  target.addEventListener('error', boundErrorHandler);
+}
+
+function unregisterUnhandledError(target) {
+  if (boundErrorHandler === null) {
+    return;
+  }
+  target.removeEventListener('error', boundErrorHandler);
+  boundErrorHandler = null;
+}
+
+export { registerUnhandledError as register, unregisterUnhandledError as unregister };